Hybrid stepper motor with a torque density that is optimized

摘要

A stator having an outer and inner diameters, hybrid stepper motors optimized (57) ie torque SUMMARY] per unit volume of the "torque density", is drivingly connected to the shaft and is positioned rotatably in the stator inner diameter I and a rotor. It is a permanent magnet having at least one permanent magnet positioned in the shaft, and the rotor includes a rotor two segments are coupled to both ends of the permanent magnet. Each of the rotor segments, and has a length that is calculated so as to optimize the torque density of the motor. Optimization of rotor length segment by calculation is given as a function of the ratio of the stator inner diameter with respect to the stator outer diameter. When optimizing the length of the rotor segments, consider a value within the range equations minimum length and maximum length is defined for the ratio of inner diameter to outer diameter of the stator given.